643143212 has 24 divisors (see below), whose sum is σ = 1136827440. Its totient is φ = 318348800.

The previous prime is 643143209. The next prime is 643143257. The reversal of 643143212 is 212341346.

It is a super-2 number, since 2×643143212² = 827266382283353888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228212 + ... + 231012.

It is an arithmetic number, because the mean of its divisors is an integer number (47367810).

Almost surely, 2^643143212 is an apocalyptic number.

It is an amenable number.

643143212 is a deficient number, since it is larger than the sum of its proper divisors (493684228).

643143212 is a wasteful number, since it uses less digits than its factorization.

643143212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361 (or 3359 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 643143212 is about 25360.2683739743. The cubic root of 643143212 is about 863.1823737218.

Adding to 643143212 its reverse (212341346), we get a palindrome (855484558).

The spelling of 643143212 in words is "six hundred forty-three million, one hundred forty-three thousand, two hundred twelve".